Day 14. Took me a looong time to figure out how to use the map right for some reason
parent
68f1500953
commit
40798151a9
GPG Key ID:
AB49BD6B2B3A6377
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const std = @import("std");
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pub fn main() !void {
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const content = @embedFile("data.txt");
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var gpa = std.heap.GeneralPurposeAllocator(.{}){};
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const allocator = gpa.allocator();
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var grid = std.ArrayList(std.ArrayList(u8)).init(allocator);
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defer grid.deinit();
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var grid2 = std.ArrayList(std.ArrayList(u8)).init(allocator);
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defer grid2.deinit();
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var lines = std.mem.split(u8, content, "\n");
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while (lines.next()) |line| {
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if (line.len < 1) {
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break;
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}
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var lineArrayList = std.ArrayList(u8).init(allocator);
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var lineArrayList2 = std.ArrayList(u8).init(allocator);
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for (line) |char| {
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try lineArrayList.append(char);
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try lineArrayList2.append(char);
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}
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try grid.append(lineArrayList);
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try grid2.append(lineArrayList2);
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}
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var map = std.StringHashMap(usize).init(allocator);
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defer map.deinit();
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transpose(&grid);
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try tiltWest(&grid);
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transpose(&grid);
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var part1 = calculateLoad(grid);
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std.debug.print("part 1: {d}\n", .{part1});
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var prev: usize = 0;
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var loop: usize = 0;
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const MAX = 1_000_000_000;
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for (0..MAX) |i| {
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// see if this grid arrangement is in our map
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const key = try getKey(&grid2);
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const hashed = map.get(key);
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// if it is, we've found a loop
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if (hashed) |val| {
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prev = val;
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loop = i;
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break;
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}
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try cycle(&grid2);
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// add the new grid arrangement to the map
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try map.put(key, i);
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}
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// figure out where in the loop we should stop
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const stop = (MAX - prev) % (loop - prev);
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// cycle that many more times
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for (0..stop) |_| {
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try cycle(&grid2);
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}
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var part2 = calculateLoad(grid2);
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std.debug.print("part 2: {d}\n", .{part2});
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}
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fn getKey(grid: *std.ArrayList(std.ArrayList(u8))) ![]u8 {
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var gpa = std.heap.GeneralPurposeAllocator(.{}){};
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const allocator = gpa.allocator();
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var str = std.ArrayList(u8).init(allocator);
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for (grid.items) |row| {
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try str.appendSlice(row.items);
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}
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return str.items;
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}
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fn cycle(grid: *std.ArrayList(std.ArrayList(u8))) !void {
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transpose(grid); // to tilt north, transpose so north is left
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try tiltWest(grid);
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transpose(grid); // to tilt west, transpose again
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try tiltWest(grid);
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// at this point, grid is back to normal
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flipY(grid); // to tilt south, flip (south is up) then transpose (south is left)
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transpose(grid);
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try tiltWest(grid);
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// at this point, south is left, west is up. we want east left
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transpose(grid); // south is up, west is left
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flipY(grid); // grid is back to normal
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flipX(grid);
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try tiltWest(grid);
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flipX(grid);
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}
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fn calculateLoad(grid: std.ArrayList(std.ArrayList(u8))) usize {
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var load: usize = 0;
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for (grid.items, 0..) |row, rowNum| {
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var rowMultiplier = grid.items.len - rowNum;
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for (row.items) |cell| {
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if (cell == 'O') {
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load += rowMultiplier;
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}
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}
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}
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return load;
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}
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fn tiltWest(grid: *std.ArrayList(std.ArrayList(u8))) !void {
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for (grid.items) |row| {
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for (row.items, 0..) |cell, i| {
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if (cell == 'O' and i != 0 and row.items[i - 1] == '.') {
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var j = i;
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while (j > 0) {
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row.items[j - 1] = 'O';
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row.items[j] = '.';
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j -= 1;
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if (j < 1 or row.items[j - 1] != '.') {
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break;
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||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// assumes square grid
|
||||
fn transpose(grid: *std.ArrayList(std.ArrayList(u8))) void {
|
||||
const length = grid.items.len;
|
||||
|
||||
for (0..length - 1) |i| {
|
||||
for (i + 1..length) |j| {
|
||||
const temp = grid.items[i].items[j];
|
||||
grid.items[i].items[j] = grid.items[j].items[i];
|
||||
grid.items[j].items[i] = temp;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// flip a grid upside down
|
||||
fn flipY(grid: *std.ArrayList(std.ArrayList(u8))) void {
|
||||
const height = grid.items.len;
|
||||
|
||||
for (0..height / 2) |r| {
|
||||
const temp = grid.items[r];
|
||||
grid.items[r] = grid.items[height - r - 1];
|
||||
grid.items[height - r - 1] = temp;
|
||||
}
|
||||
}
|
||||
|
||||
// flip a grid left to right
|
||||
fn flipX(grid: *std.ArrayList(std.ArrayList(u8))) void {
|
||||
const length = grid.items.len;
|
||||
|
||||
for (0..length) |r| {
|
||||
for (0..length / 2) |c| {
|
||||
const temp = grid.items[r].items[c];
|
||||
grid.items[r].items[c] = grid.items[r].items[length - c - 1];
|
||||
grid.items[r].items[length - c - 1] = temp;
|
||||
}
|
||||
}
|
||||
}
|
||||
@ -0,0 +1,10 @@
|
||||
O....#....
|
||||
O.OO#....#
|
||||
.....##...
|
||||
OO.#O....O
|
||||
.O.....O#.
|
||||
O.#..O.#.#
|
||||
..O..#O..O
|
||||
.......O..
|
||||
#....###..
|
||||
#OO..#....
|
||||
Loading…
Reference in New Issue